whitedust; Please excuse my sarcasm. No harm intended!!! You are a solid, fully committed snowmobile guy, and that I respect. I do understand you, and many others sledders going to 4 strokes due to 2 stroke failures of one kind or another. Yes, all the mfr's had them. I also understand your thoughts as to servicing the problems no matter what it was. You, and the other riders like you, very much like the 4 stroke reliability, durability, torque, and so on!!! So do I!!! I would say if you watch the mountain guys, they will provide you with what you are looking for in reliability, durability, and forcing the hp issues with this new 900T. It's being available in the G4 platform, and its light weight, compact size, they will pound this thing hard. They love the turbo advantage!!! The PDrive clutch will benefit all riders, no matter how, or where they ride. There are many more variants of the ACE engines to come in the future as it appears. I will be waiting on the one just below this 150hp. It doesn't seem this 150 is the highest HP variant ACE engine you will see. As the Ace engine line was developed as to be multi purposed from the get go. Doo/Rotax has worked on this 900T for some years now. It would surprise me if there were any problems other than perhaps tweaking the first year clutch tuning. Happy trails, be safe, and please keep us updated on riding conditions as you see them!!!